Quantum confinement in atomically-thin TMDCs enables the realization of deterministic single-photon emitters. The position and polarization control of single photons have been achieved via local strain engineering using nanostructures. However, most existing TMDC-based emitters are operated by optical pumping, while the emission sites in electrically pumped emitters are uncontrolled. Here, we demonstrate electrically driven single-photon emitters located at the positions where strains are induced by atomic-force-microscope indentation on a van der Waals heterostructure consisting of graphene, hexagonal-boron nitride, and tungsten diselenide. The optical, electrical, and mechanical properties induced by the local strain gradient were systematically analyzed. In particular, single-photon emission was observed at the indentation sites at 4 K. The emission exhibits photon anti-bunching behavior with a g(2)(0) value of ~0.3, intensity saturation and a linearly cross-polarized doublet. This robust spatial control of electrically driven single-photon emitters will pave the way for the practical implementation of integrated quantum light sources.
@article{arxiv.2105.01312,
title = {Electrically driven strain-induced deterministic single-photon emitters in a van der Waals heterostructure},
author = {Jae-Pil So and Ha-Reem Kim and Hyeonjun Baek and Hoo-Cheol Lee and Woong Huh and Yoon Seok Kim and Kenji Watanabe and Takashi Taniguchi and Jungkil Kim and Chul-Ho Lee and Hong-Gyu Park},
journal= {arXiv preprint arXiv:2105.01312},
year = {2021}
}